feat: introduce UX Extension and Base Folder Strategy

CONTRIBUTING.md

@@ -352,6 +352,21 @@ npm run lint
 - **Imports:** Pay special attention to import paths. The project uses ESLint to
   enforce restrictions on relative imports between packages.
 
+### Project structure
+
+- `packages/`: Contains the individual sub-packages of the project.
+  - `a2a-server`: A2A server implementation for the Gemini CLI. (Experimental)
+  - `cli/`: The command-line interface.
+  - `core/`: The core backend logic for the Gemini CLI.
+  - `test-utils` Utilities for creating and cleaning temporary file systems for
+    testing.
+  - `vscode-ide-companion/`: The Gemini CLI Companion extension pairs with
+    Gemini CLI.
+- `docs/`: Contains all project documentation.
+- `scripts/`: Utility scripts for building, testing, and development tasks.
+
+For more detailed architecture, see `docs/architecture.md`.
+
 ### Debugging
 
 #### VS Code